$9-9y^8$
$\frac{x+5}{7x+2}-\frac{x-7}{5x+1}=7$
$\lim_{x\to\infty}\left(6sinx\right)\left(lnx\right)$
$t^2-2t-1$
$\left(3^4+5.7\right)$
$\frac{1}{2}x^3+2^3$
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